﻿// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#region 导入名称空间

using System.Collections.Generic;
using System.Diagnostics;

#endregion

namespace LightWork.DynamicProxy.Generators
{
    public class NamingScope : INamingScope
    {
        private readonly IDictionary<string, int> names = new Dictionary<string, int>();

        public NamingScope()
        {
        }

        private NamingScope(INamingScope parent)
        {
            ParentScope = parent;
        }

        public INamingScope ParentScope { get; }

        public string GetUniqueName(string suggestedName)
        {
            Debug.Assert(string.IsNullOrEmpty(suggestedName) == false,
                "string.IsNullOrEmpty(suggestedName) == false");

            int counter;
            if (!names.TryGetValue(suggestedName, out counter))
            {
                names.Add(suggestedName, 0);
                return suggestedName;
            }

            counter++;
            names[suggestedName] = counter;
            return suggestedName + "_" + counter;
        }

        public INamingScope SafeSubScope()
        {
            return new NamingScope(this);
        }
    }
}